81290 has 16 divisors (see below), whose sum is σ = 159840. Its totient is φ = 29520.

The previous prime is 81283. The next prime is 81293. The reversal of 81290 is 9218.

It is an alternating number because its digits alternate between even and odd.

It is a plaindrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (81293) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 260 + ... + 479.

It is an arithmetic number, because the mean of its divisors is an integer number (9990).

2⁸¹²⁹⁰ is an apocalyptic number.

81290 is a deficient number, since it is larger than the sum of its proper divisors (78550).

81290 is a wasteful number, since it uses less digits than its factorization.

81290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 757.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 81290 is about 285.1140122828. The cubic root of 81290 is about 43.3190617039.

The spelling of 81290 in words is "eighty-one thousand, two hundred ninety".